Morse code driver for Raspberry Pi. Prints text from a text file.

blinkTxt.py

#!/usr/bin/env python

""" 
   BlinkTxt - Spike Snell - 2013
   Modified from Morse_Gmail.py
   by m0xpd December 2012
"""
# Import what we need
import time, sys
import RPi.GPIO as GPIO

"""        Dictionary for Morse Code Characters         """ 

morse={'a':'01','b':'1000','c':'1010','d':'100','e':'0','f':'0010','g':'110',
'h':'0000','i':'00','j':'0111','k':'101','l':'0100','m':'11',
'n':'10','o':'111','p':'0110','q':'1101','r':'010','s':'000','t':'1',
'u':'001','v':'0001','w':'011','x':'1001','y':'1011','z':'1100',
'0':'11111','1':'01111','2':'00111','3':'00011','4':'00001',
'5':'00000','6':'10000','7':'11000','8':'11100','9':'11110',
'.':'010101',',':'110011','?':'001100','/':'10010','@':'011010',
'!':'00110','\'':'011110','\"':'010010',' ':'',':':'111000',
';':'111000','*':'10001','-':'010101'}
# Last line are some kludges, there are no standard morse code
# Equivalents for these characters so substitute colon for semicolon
# And substitute asterisk for the equals sign, and dash for period

# Adjust Morse Speed by changing the DitLength
DitLength=0.1 # (seconds)
DahLength=3*DitLength

# Set Up the GPIO to use pin 5
GPIO.setmode(GPIO.BOARD)
GPIO.setwarnings(False)
GPIO.setup(5, GPIO.OUT)
GPIO.output(5, False)

# A few function definitions
def SendDit(Length):
	""" Sends a Dit """
	KeyDown(Length)
	Last_Element="dit"
	return Last_Element

def SendDah(Length):
	""" Sends a Dah """
	KeyDown(Length)
	Last_Element="dah"
	return Last_Element

def SendSpace(Length):
	""" Wait for inter-element space """
	time.sleep(Length)
	return

def KeyDown(Length):
	""" Keys the TX """
	# Set the output to Key Down
	GPIO.output(5, True)
	time.sleep(Length)
	# Clear the output
	GPIO.output(5, False)
	return

def BlinkWord(Word):
    for i in range(0,len(Word)):
        morse_character=morse[Word[i].lower()]
        for element in range(0,len(morse_character)):
            if morse_character[element]=="0":
                junk=SendDit(DitLength)
                SendSpace(DitLength)
            else:
                junk=SendDah(DahLength)
                SendSpace(DitLength)
        SendSpace(DahLength)
    time.sleep(1) 

# Main Operating Loop
while True:

    # Open a file
    with open(sys.argv[1], "r") as f:

        print "Opening file for blinking: ", f.name

        # Open up the file and split up all the words into all_words
        all_words = map(lambda l: l.split(" "), f.readlines())
    
        # Blink out every word in all_words
        for i in range(0,len(all_words)):
               for s in all_words[i]:
                   # Print the word to the screen
                   print s.rstrip('\n')
                   # Blink the word to the light
                   BlinkWord(s.rstrip('\n'))
    break

http://www.youtube.com/watch?v=Fxt3UvCt4R0

This is a sample video of a Raspberry Pi blinking out the full text of the Tao Te Ching written by Lao-tzu from a translation by S. Mitchell.

Full text available at: nrg0.org/t.txt

Pictures: minus.com/lzeqUnDviv1YE minus.com/l3e0estbnwaee